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C# Entity Framework Basics Extending Our Entity Data Model Defining a Many-to-Many Relationship with an Explicit Bridge Entity

Chan Nyein Aung
PLUS
Chan Nyein Aung
Courses Plus Student 2,833 Points
Posted by Chan Nyein Aung
Chan Nyein Aung
Courses Plus Student 2,833 Points

Many-to-Many Relationship and Context Class

Hi James,

  1. For Context Class, Why we only have ComicBook DbSet? Why don't we need others like Artist and Series?

  2. I'm just wonder what are pros and cons between Explicit Bridge Entity and the previous way.

  3. What's the relationship between Role and Other two (ComicBook and Artist)?

  4. I didn't see any ICollection in Role. Does it mean we don't need to put it if we use Explicit Bridge Entity to set relationship?

  5. Just confused how come we can add ComicBookArtist to Artists? Artists.Add(new ComicBookArtist() { Artist = artist, Role = role });

  6. Is Bridge Entity something like middle thing? Every entity will connect it as one(entity)-to-many(bridge) relationship?

Thanks in advanced.

1 Answer

HIDAYATULLAH ARGHANDABI
HIDAYATULLAH ARGHANDABI
21,058 Points
HIDAYATULLAH ARGHANDABI
HIDAYATULLAH ARGHANDABI
21,058 Points

1.For Context Class, Why we only have ComicBook DbSet? Why don't we need others like Artist and Series? I agress Since they are related tables they will be also place by entityFramework I'm just wonder what are pros and cons between Explicit Bridge Entity and the previous way. Will you have the model to touch they way you want in a single bridge file What's the relationship between Role and Other two (ComicBook and Artist)? Role belongs to the Artist I didn't see any ICollection in Role. Does it mean we don't need to put it if we use Explicit Bridge Entity to set relationship? Yeah Just confused how come we can add ComicBookArtist to Artists? Artists.Add(new ComicBookArtist() { Artist = artist, Role = role }); we are adding throught the bridge class data/model Is Bridge Entity something like middle thing? Every entity will connect it as one(entity)-to-many(bridge) relationship? It is like two table connection table if you add the data in bridge it will move the real table too